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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Compressing C:\Users\All Users\Microsoft\ClickToRun\ProductReleases

Posted by jpluimers on 2020/11/27

Microsoft keeps more and more under C:\Users\All Users\Microsoft\ClickToRun\ProductReleases (also accessible via C:\ProgramData\Microsoft\ClickToRun\ProductReleases or more precisely %AllUsersProfile%\Microsoft\ClickToRun\ProductReleases).

This can be huge, running into 10s of gigabytes, which – for todays cloud, VM and light-weight device based world – is huge.

Compressing seems to fail for me consistently, as I get “access denied” while compressing when elevating from Windows Explorer.

So this is a reminder to sort this out eventually.

These did not help yet:

I don’t dare deleting it:

Hopefully it is something explainable like the a virus scanner.


Yup: it was the Avira Virus Scanner.

Somehow it has the Windows Explorer UI cause an “Access Denied” message to appear when elevating, but you can still compress files fine in a subdirectory with these steps:

Given a subdirectory named C:\SomeDir\A do this:

  1. pushd C:\SomeDir\A
  2. compact /c /s *.*
  3. cd ..
  4. compact /c A
  5. popd

It is not the first time I bump into Avira stuff (but I only blogged about it once, dumb me: VirusTotal: Avira marks a Delphi built executable als false positive), but the decision of using it was outside my control.


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